公开(公告)号：US10962608B1

公开(公告)日：2021-03-30

申请号：US16688168

申请日：2019-11-19

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Normann Fischer ,  Raymond W. Rice ,  Ravindra P. Mulpuri ,  James Mobley

IPC: G01R31/50 ,  G01R31/62 ,  G01R31/3185

Abstract: The present disclosure pertains to systems and methods for monitoring and protecting an electric power system. In one embodiment, a system may comprise line-mounted wireless current transformers to measure at least one parameter of an alternating current (AC), receive a synchronization signal at which to measure the AC, and send a message comprising the measured AC. The system may also comprise an intelligent electronic device (IED) to send the synchronization signal to and receive the messages from the line-mount wireless current transformers, determine whether a high-impedance fault (HiZ) exists between the line-mounted wireless current transformers, and implement a control action based on the existence of the HiZ fault.

公开(公告)号：US10819261B1

公开(公告)日：2020-10-27

申请号：US16732838

申请日：2020-01-02

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney ,  Normann Fischer

IPC: H02P9/00 ,  H03K17/082 ,  H02M7/5387 ,  H02H3/08 ,  G01R31/02 ,  G01R29/16

Abstract: Electric power generator protection is secured by detecting wiring errors to an intelligent electronic device using terminal third voltages at the terminal (VT3) and third harmonic voltages at the neutral (VN3). When an angle between VT3 and VN3 is outside of an acceptable range, a wiring defect is detected, and certain protective operations are blocked. An alarm may be generated, facilitating personnel to identify and rectify the wiring defect. Wiring defects may further be detected when a torque calculated using VT3 and VN3 exceeds a predetermined error threshold. Security of protection elements is increased by detection of wiring defects that may have resulted in misoperation of the protection elements.

公开(公告)号：US10753976B2

公开(公告)日：2020-08-25

申请号：US15783925

申请日：2017-10-13

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Dale S. Finney ,  Normann Fischer ,  Derrick Haas

IPC: G01R31/34 ,  H01H47/00 ,  H02P9/10 ,  H02P29/024 ,  H02P29/60

Abstract: The present disclosure relates to systems and methods for detecting transient high-torque events associated with rotating machinery in an electric power system. In one embodiment, a relay may include an electrical parameters module that receives a representation of a voltage and a current at a terminal of rotating machinery in an electric power system. A torque calculation module may continuously determine a calculated torque value for the rotating machinery using the representation of the voltage and the current at the terminal of the rotating machinery and compare each calculated torque value to a threshold. An action module may generate an alarm when the calculated torque value exceeds the threshold. A log module may generate a log comprising a peak of the calculated torque value and a time at which the peak torque value occurs.

公开(公告)号：US10522995B2

公开(公告)日：2019-12-31

申请号：US15622006

申请日：2017-06-13

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Bogdan Z. Kasztenny ,  Mangapathirao Venkata Mynam ,  Armando Guzman-Casillas ,  Normann Fischer

IPC: H02H3/02 ,  H02H3/30 ,  H02H7/26 ,  H02H1/00

Abstract: The present disclosure pertains to systems and methods for supervising protective elements in electric power systems. In one embodiment, a system may be configured to selectively enable a protective action an electric power system. The system may include a data acquisition subsystem receive a plurality of representations of electrical conditions associated with at least a portion of the electric power delivery system. An incremental quantities module may calculate incremental quantities from the plurality of representations. The system may be configured to detect an event, to determine an incremental quantities value during the event, and to determine a time-varying threshold. The incremental quantities value during the event may be compared with the time-varying threshold, and a protective action module may be enabled to implement a protective action when the value of the incremental quantities value during the event exceeds the time-varying threshold.

公开(公告)号：US20170358913A1

公开(公告)日：2017-12-14

申请号：US15622006

申请日：2017-06-13

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Bogdan Z. Kasztenny ,  Mangapathirao Venkata Mynam ,  Armando Guzman-Casillas ,  Normann Fischer

IPC: H02H3/02 ,  H02H7/26 ,  H02H1/00

CPC classification number: H02H3/02 ,  H02H1/0007 ,  H02H1/0084 ,  H02H3/30 ,  H02H7/26 ,  H02H7/263 ,  H02H7/265

Abstract: The present disclosure pertains to systems and methods for supervising protective elements in electric power systems. In one embodiment, a system may be configured to selectively enable a protective action an electric power system. The system may include a data acquisition subsystem receive a plurality of representations of electrical conditions associated with at least a portion of the electric power delivery system. An incremental quantities module may calculate incremental quantities from the plurality of representations. A protective module may be configured to detect an event, to determine an incremental quantities value during the event, and to determine a time-varying threshold. The incremental quantities value during the event may be compared with the time-varying threshold, and a protective action module may be enabled to implement a protective action when the value of the incremental quantities value during the event exceeds the time-varying threshold.